Glued-bag and method of producing the same



c. K. BILLEB l GLUED BAG AND METHODv 0F PRODUCING THE SAME 1 fEiledfJune 21, 1947 2 Sheets-Sheet l .xwhmw INVEN TOR. BQXQM ATTO/A/i/.

Iluulluillllululn May 23, 1950 c. K. BILLEB 2,509,125

GLUED BAG AND METHOD OF' PRODUCING THE SAME Filed June 21, 1947 2Sheets-Sheet 2 Patented May 23, 1950 A l 1 32 yThe present'inventionerelates Lgenerally to'iimavantages -fofzth'e'-inventi'onswillbe sapparentrom Aproveinents in the art ofmanufacturingbag-like vnahe.following fdetaileddescripton. receptaclesand relates lmore -specifcally Ito an clearrc(inceptionaoftheseveralstepszi-nvolved :improved 4bag 'structure 'and to an 'improvedginithempizm/zed :method-of 'producing :thefifnew method '.of'andapparatus forlproduoingthefim- --fgftuedsbagarandffottypcaifapparatus:,'forieect- 'proved structures or articles.ling#commercialfexploitationrof'dzlflezmethodunay 'It has .heretoforeLheen Acommon commeroial #befhadrbyfreferringtozthezdrawirrgsaccompanynpractice to manufacture vvbags for :merchandising Ysing. and'-xfOI'mHg `1 a vipart of athis "specification .'ziiverse commodities,of heat Vsealalle ribon whereinrlike referencercharactersesgnatefilthestockrgbyinitially forming the stock-into an 'elon- 10,fsamemnsimilar"parts in"thef variousfyiewsgated "flat :'tube,bythereafter severingthe 4tuloe 'Fig. :isfa-.di-agramrnaticesideiviewtof aftypoal finto sections `of suitable length by subsequentlyinstallation for automatically producing :my'rim- ,'folding an end .ofeach liiattene'd tube sect-ion l:proved@gluedfbfagsfrl aPdISU-CGSSSOH;

upon itself, and by finally 'applying heat and fFg.*Zeis'anfenlaiigedniagrammatic Sidewiew rpressure to eachiolded overporti-on itoi-heatseal l15 yofwthe bag-rhot-tom foldingfandeglueingrotorfconthe .end of the tube section andtoithus produceIstituti-ns1 aqua-ft of the" installation OfeEig.. 1s .a 'bag 'having a:thoroughly `sealed bottom. In .F-ig. :3 .isafvf-urth'erfenlargedfdiagramedepicting somecasesand especially Whereaiiquidtightbot- -xthefsucoessivelbag bottom;formingfstepsfzmvpwed .tomwas requiredthe tube endfhasbeen double in my new bag production method;Lfolded and heat sealed, and :While l'these prior '20 Eig. is :a @12mTAVS'W'J 4511 bOltO-mfplfin 0f heatsealing methods are quite"satisfaot'oryas .-onelothe\improvedlbags--producedby'mymesent .applied`to .stock whichlisvcapable .of being'sealed JIISSIIGO; -and with. themere application of heat 'and g pressure, .-Fie. v`5 is a eansideralalyYenlarged fragmentary A.such stool; Yis not always 'available' andY'mayfnot perspective VGWHO ythe13017110111 portion'- Ofeoneff beesati-sfactory .for 'the intended use. "It Ifre- :.25 he -umpmved abags,:shewingvfthe sealing Vfolcls quently happens .1;h9',1;..0ther types ofnon-,heatyepartialliyadisrupted to-folearlyfreveal therbagrzbotfteredrinproducing .such ...glued Lbottom lbags `and @11d -iallpalllltfnnjheaieelable --matelfiaL it 1in-maintaininglthebagbottoms 'tightlyand per- `l'S 1.107 my` desire or .intention to llnrleeeSSallY `mmlermySeam@ againstaeakage when ktherbags limit ,the .inventionoy -mrtueaof--.ths :rrestricted ,Substances therethrough' the ^`tuhe .inwardly tovoverlapping ,position and :Another 1.important object ofthisinvention-is by '-adheslv'ely eumtmg 'the fovellapped ribbon topmvdeanimpmvedmethod .of Apmducmgheb edges..I,thenseyenthetube.untosuocessive secmetioally 'sealed :glued v.'hottomvbags from s'rela- "mms "Sutab1e'-l-ength after Which'th'cmire'tivelyfthin vribbon stockfin rapid succession fand :gl

gt-nt f th tu, t. ,t attached@.theadjacenaourer wan omhemubuje- No. .JesVe presen Ilm/en 1011 lsf y 0 .larfsectiomtolprovideaetemporaisyhottomgolosure P1' OVIe'SIm-Ple an'd highly emclent zippafratus for l=50,hayingatdeastour..thcknessesof .the'sheetstock eiecting automaticexploitation vof '.theumproved.

p K y throughout its area. The ,preliminarilygiolded 1h35 producingmethod and -01`-manufactur1ng v4and.glued.bottotnportionoffeaohhagseotion, is

Y .theimemved base-man expeditousandreliable thereafter folded .uponitseif.a1ongaiinexfmanner. tending across the ...bag .intermediate thelower These and other :more specific -objects and laid-. 55 and riipperedges .of v.th.e ..1'nitalfold, and the mesultant iinal fold isadhesively connected to the outer surface of the remainder of thepreliminary fold and to the same outer wall of the bag beyond the zoneof attachment of the original fold, thereby completing the bag bottom.The nal bag bottom closure thus produced, has at least eight thicknessesof sheet material throughout an area extending upwardly along the bagfor a considerable distance, and also has at least as many thicknessesof stock at the extreme lower end thereof; and each bag closure ishermetioally sealed along three extensive superimposed areas ofadhesive, thus providing a triple seal.

When carrying on commercial exploitation of my improved bag producingmethod, I prefer to utilize an installation substantially as showndiagrammatically in the drawings, in order to rapidly, automatically,and effectively construct the successive bags. Referring to Figs. 1, 2and 3 of the drawings, the initial thin and flexible ribbonv8 of anyrelatively impervious sheet stock, such as regenerated cellulose, may besupplied in the form of a rotatably supported roll 9 from which theribbon 3 may be constantly withdrawn by a set of draw rolls I0, suppliedalong an edge with glue or other adhesive by a center seam glue wheelII, and converted into a constantly advancing flat tube having alongitudinal glued seam I2 at the overlapped ribbon stock edges by atube forming unit I3. The tube thus initially formed may be providedwith opposite inwardly extending side pleats I5 extending parallel tothe seam I2 as in Fig. 4, and immediately after the seam I2 has beencompleted, the advancing tube may be delivered by another set of drawrolls IS to a cut-olf knife assembly which severs the continuous tubeinto successive tube or bag sections |8 of suitable length, in a wellknown manner.

The successive tubular bag sections IB are delivered by a set of breakerrolls I9 from the severing zone to the upper rear portion of theperiphery of a rotating bag blank conveying and bottom forming cylinderor rotor 20 having two revolving cylindrical tuckers 2| associatedtherewith. This cylindridal rotor 20 is rotatable within a frame and isprovided with an annular series of equally spaced peripheral gaps 22within each of which a clamping plate 23 is swingably disposed foroscillation about the axis of a carrier pivot 24, so that each plate 23may clampingly cooperate with the opposite sides of its confining gap22. While only two of these gaps 22 and plates 23 have been shown in thediagrams, there are in fact six or more sets of gaps and plates spaceduniformly about the axis of the rotor 20, and the supporting pivots 24of these plates are mounted in and are revolvable by the rotor. Theouter ends of each of the pivots 24 are provided with rock levers 25each having a roller 26 journalled in its swinging end, and theserollers 25 coact and are constantly urged into engagement with fixedcams 2'|, by means of tension springs 28. This cam and lever assemblageis such that when the rotor 2|) is revolving in the direction indicatedby the arrow, the successive clamping plates 23 will be swung intoclamping engagement with the opposite sides of their confining slots orgaps 22 at timed intervals so as to clamp and to release various lowerend portions of the successive bag blanks or sections I8.

The two revolvable cylindrical tuckers 2| which rare disposed above andforwardly of the rotor are rotatable in unison with but in directionsopposite to the direction of rotation of the rotor cylinder 20, and eachtucker 2| carries a pair of diametrically opposite radial tucking blades30 which are adapted to enter and leave the successive rotor gaps 22,and which are also cooperable with adjacent adhesive or glue supplyrollers 3| so as to receive adhesive therefrom. As shown in Fig. 2,there is a glue transfer roller 3| provided for each tucker 2|, and theglue transfer and tucking blades 3G are adapted to enter the successiverotor slots 22 on opposite sides of the conned and oscillating clampingplates 23. 'I'he tuckers 2| and the glue transfer rollers 3| are ofrelatively well known construction, but the manner in which thesetuckers 2| coact with the rotor clamps and with the successive bagblanks I8 to provide triple bottom seals, is new, and the rotor cylinderis embraced between tuckers by a stationary wall and is provided at itslower front portion with a pick-off blade 32 for removing the completedbags therefrom and for delivering the finished product to a dryer or thelike.

During normal operation of the equipment hereinabove described, andwhile exploiting my new bag producing method, the draw rolls I0, I6 areoperating to constantly withdraw at ribbon stock 8 from the supply roll9, and the glue roll Il is functioning to apply adhesive to thelongitudinal side edge portion of the advancing ribbon, while theforming unit I3 converts the stock band into a continuous elongated flattube having a central seam I2 and opposite side pleats I5 extendingthroughout its entire length, as shown in Fig. 4. Upon delivery of thisfiattened tube from the second set of draw rolls I6, it is severed intopredetermined lengths or tubular sections I8 by the knife assembly Il,whereupon the successive severed sections pass between the breaker rollsIS and are deposited upon the periphery of the rapidly revolving rotor2l, beingguided by the rotor embracing wall in a well known manner, intothe paths of revolution of the clamping plates 23 and of the tuckerblades 30, preparatory to the application of the improved bottomclosures.

The successive steps involved in the formation of the successive triplebottom seals, are illustrated diagrammatically in Fig. 3, and as shownat the extreme right, step I consists of the provision of a transversefold or tuck 33 some distance from one end of each advancing bagsection, by causing one of the glue coated tucker blades 30 of the uppertucker 2| to enter the adjacent rotor gap 22 to the left of thecorresponding clamping blade 23. In addition to forming the tuck 33, theblade 30 deposits glue into this tuck; and as soon as the tuck 33 hasbeen formed, the blade 23 is swung toward the left and compresses andclamps this tuck while the tuck producing blade 3U is withdrawn from thegap 22 as indicated by step II, thus also spreading the glue andprojecting the end portion 34 of the bag blank I8 outwardlyperpendicular to the main body thereof. Immediately followingstep II,the outwardly projecting portion 34 of the advancing tube section I8 isfolded back and is pressed and glued against the adjacent centrallyseamed outer wall 35 of the bag blank as shown in step III, by causingthe portion 34 to engage the rotor embracing stationary Wall of theframe located between the tuckers, in a well known manner, therebyproviding the preliminary bag bottom seal.

Each initial bottom seal is thereafter provided with a second transversetuck 36 and glue application as depicted by step IV, by causing one ofthe glue coated tucker blades 30 of the lower tucker 2| to enter thesame rotor gap 22 to the right of the same clamping blade 23. Inaddition to forming the tuck 33, this final tucking blade deposits glueinto this tuck, and immediately following the formation of the tuck 36the previously folded remote end portion 3'I of the bag I8 is projectedoutwardly perpendicular to the bag body and the tuck 33 is compressed,by causing the clamping blade 23 to swing toward the right, as indicatedby step V. While the nal tuck 36 is thus clamped, the folded portion 31of the bag section I8 will be folded back and pressed and glued againstboth the end part 38 and the seamed outer wall of the bag I8 as shown instep VI, by another stationary frame wall near the rotor periphery, thuscompleting the bag bottom closure and providing a triple glued seal foreach of the successive bags. The clamping plate 23 will 'be subsequentlyreleased, and the successive nished bags I8 will be delivered to thedryer by the pick-on blade 32 in an obvious manner.

The improved bag producing method is thus I' carried on continuously,effectively, and automatically with the aid of simple equipment, tocomplete successive improved bags I8 such as shown in Figs. 4 and 5, inrapid succession. Each of the final bags I8 is provided with an adhesiveseal between the folded portions 34, 31, with a second adhesive sealbetween the bag wall 35 and the remote end portion 38 of the blank, andwith a third adhesive seal between the folded portion 34 and the wall 35and portion 38, as clearly shown in the partially disrupted perspectiveview of Fig. 5. By utilizing relatively impervious stock or material inthe production of these bags, the triple bottom seal thus provided willhermetically seal the bag bottom against egress or ingress of air, vaporor other fluent substances; and by forming the Ibags I8 with the bottomfolds overlapping the seams i2, these seams are thoroughly reinforcedand protected against opening when the bags are nally filled withcommodity. While the normally concealed sealing portions 38 may be madeof the same length as the covering portions 34, 31, such lengtheningserves no useful purpose and considerable stock is saved by shorteningthese portions 38 as shown; and when the bags I8 are provided with sidepleats I5 the lower outer corners of the bottom of each bag will havesixteen thicknesses of stock While the medial bottom portions will haveeight thicknesses, thereby providing a relatively rigid bottom even whenrelatively thin and flexible sheet stock is utilized.

From the foregoing detailed description it will be apparent that mypresent invention provides an improved glued bottom bag adapted to bemanufactured from relatively inexpensive stock, and the bottom of whichis thoroughly reenforced and sealed against leakage. By utilizing theimproved method in the manufacture of these bags. the speed or rate ofproduction may be enhanced to a maximum and the cost may be minimized;and the apparatus shown and described herein, while embodying many wellknown features is reliable and highly eicient in operation, and may bereadily modified and adjusted to produce the improved bags in variousshapes and sizes. The invention has in fact gone into extensive andhighly successful commercial use especially for the production of flatpleated bags I8 from transparent and relatively thin and flexibleregenerated cellulose and the like, and these commercial bags I8 haveproven very satisfactory for the purpose of packing and merchandisingdiverse commodities which are amply protected and maintained in freshand wholesome condition by virtue of the improved triple sealed bottomconstruction. The improved flat bags may be decorated by printing orotherwise, with suitable indicia, and the side pleats I5 materiallyenhance the holding capacities of the receptacles.

It should be understood that it is not desired to limit this inventionto the exact steps of the production method or to the precise details ofconstruction of the bags, herein described and shown, for variousmodifications Within the scope of the appended claims may occur topersons skilled in the art; and it is also contemplated that specificdescriptive terms used herein be given the broadest possibleinterpretation consistent with the disclosure.

I claim:

1. An article of manufacture comprising, a bag having a flatsubstantially rectangular tubular body one end of which hassubstantially coinciding free edges, said one end being initially foldedand glued to the outer surface of the tubular body, and said initiallyfolded portion being refolded in the same direction along a fold linelocated between the transverse center line thereof and the said freeedges and glued against a portion of the initial fold and directlyagainst the tube surface.

2. An article of manufacture comprising, a bag having a fiatsubstantially rectangular tubular body provided with a longitudinallyseamed Wall and one end of which has substantially coinciding freeedges, said one end being initially folded and glued to the outersurface of the seamed Wall, and said initially folded portion beingrefolded in the same direction along a fold line located between thetransverse center line thereof and the said free edges and glued againsta portion of the initial fold fand directly against the tube surface.

3. The method of producing glued bottom bags, Which comprises, forming aflat substantially rectangular tubular blank having substantiallycoinciding free edges at one end thereof, initially transversely foldingsaid end of the blank and gluing the fold against the adjacent outersurface of the tube, and refolding the initially folded portion in thesame direction along a fold line located between the transverse centerline thereof and the said free edges and gluing the second fold againsta portion of the initial fold and directly against the tube surface.

CLYDE K. BILLEB.

REFERENCES CITED The following references are of record in the le o-fthis patent:

UNITED STATES PATENTS Number Name Date 917,124 Pierson Apr. 6, 19091,782,240 Litchfield Nov. 18, 1930 1,926,065 School Sept. 12, 19331,950,232 Edgerly Mar. 6, 1934 1,975,253 Connolly Oct. 2, 1934 2,012,357Shea Aug. 27, 1935 2,013,672 Royal Sept. 10, 1935 2,023,782 Driver Dec.10, 1935 2,294,848 Moore Sept. 1, 1942 2,345,434 Sterling Mar. 28, 1944

